制备了不同硬段含量的聚氨酯(PU)及其PU/有机蒙脱土(OMMT)纳米复合材料.研究结果表明,随着PU分子链中硬段含量的增加,PU分子链的刚性提高,进入硅酸盐片层间的位阻增大,使插层变得困难,从而导致进入该硅酸盐片层间的PU分子链减少.OMMT对PU有增强增韧作用,但随着PU分子链中的硬段含量增加,OMMT的增强效果下降.PU及其PU/OMMT纳米复合材料的热稳定性均随着PU分子链中的硬段含量增加而下降.
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